Add Renovate configuration files for automated dependency management

- Created .renovaterc for Renovate settings, including package rules for digest updates.
- Added renovate.config.cjs to define the Renovate bot's GitHub endpoint and author.
- Introduced a Gitea workflow in .gitea/workflows/renovate.yml to schedule daily runs of Renovate.

.gitea/workflows/renovate.yml

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+name: RenovateBot
+
+on:
+  schedule:
+    - cron: "@daily"
+  push:
+    branches:
+      - master
+
+jobs:
+  renovate:
+    container: ghcr.io/renovatebot/renovate:43
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Run renovate
+        run: |
+          renovate
+        env:
+          GITHUB_COM_TOKEN: ${{ secrets.RENOVATE_GITHUB_TOKEN }}
+          LOG_LEVEL: ${{ vars.RENOVATE_LOG_LEVEL }}
+          RENOVATE_CONFIG_FILE: renovate.config.cjs
+          RENOVATE_LOG_LEVEL: ${{ vars.RENOVATE_LOG_LEVEL }}
+          RENOVATE_REPOSITORIES: ${{ gitea.repository }}
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}

.renovaterc

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":disableDependencyDashboard"
+  ],
+  "assignees": [
+    "valentineus"
+  ],
+  "labels": [
+    "dependencies",
+    "automated"
+  ],
+  "packageRules": [
+    {
+      "groupName": "all digest updates",
+      "groupSlug": "all-digest",
+      "matchUpdateTypes": [
+        "minor",
+        "patch",
+        "pin",
+        "digest"
+      ],
+      "matchPackageNames": [
+        "*"
+      ],
+      "automerge": true
+    }
+  ]
+}

renovate.config.cjs

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+module.exports = {
+	endpoint: "https://code.popov.link",
+	gitAuthor: "renovate[bot] <renovatebot@noreply.localhost>",
+	optimizeForDisabled: true,
+	platform: "gitea",
+};